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(x+65)+(x+25)+(x)=180
We move all terms to the left:
(x+65)+(x+25)+(x)-(180)=0
We add all the numbers together, and all the variables
x+(x+65)+(x+25)-180=0
We get rid of parentheses
x+x+x+65+25-180=0
We add all the numbers together, and all the variables
3x-90=0
We move all terms containing x to the left, all other terms to the right
3x=90
x=90/3
x=30
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